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Wayside Signaling Systems Ansaldo STS USA (Formerly known as Union Switch & Signal) RSE-1D7 Rev. 4-07 Input Isolation Module (MicroLok® II and MicroLok® Object Controller Applications) To further protect and enhance the reliability of MicroLok II, MicroLok Object Controller (OC) and other system circuits, ASTS USA has developed the Input Isolation Module as a companion product to the Output Isolation Modules described in RSE-1D6. In its simplest application, the Input Isolation provides a stand alone component that can isolate an external battery source. It can also be used with the Bi-Polar Output Isolation Module to permit series-chaining of three or more M-3E or M-23E switch machines with Electronic Circuit Controllers (see RSE-3A4). General Description Advantages The Input Isolation Module is similar in operation to ASTS USA’s Output Isolation Modules, however instead of being driven from a MicroLok II or OC vital output channel, this module is driven from an external battery source. It can be used anywhere that the battery arriving from an external source requires isolation and the current demands of the output are less than 1.5 watts. • The Input Isolation Module can be set up with two unipolar inputs or with a single bi-polar input. It provides increased front end surge protection using multiple stages of MOVs, inductors, and Tranzorbs. The Input Isolation Module consists of a plastic, DIN rail-mountable module with two internal circuit boards. Built-in protection guards against a continuous short circuit condition. Connections to the module are made with four plug-in screw connectors. There are 16 screw connections which will accommodate wire size from AWG 24 to AWG 12 with two screw terminals for each connection. The plug-in connectors are individually keyed for easy replacement. Two yellow LEDs on the front of the units indicate the states of the circuit outputs. The module does not requires any field maintenance. In the unlikely event of a failure, a faulty module is easily replaced as a complete unit. To order, call 1-800-652-7276 e-mail: [email protected] • • • • • Provides input circuit isolation from external battery source Configurable with two uni-polar inputs or one 1 bipolar input Built-in protection against continuous short circuit Enhanced with surge protection components Easily installed and wired No field tests or repairs required (field-replaceable units) Specifications Input Connection Options: Input Battery Range: Load Drive (Each Circuit): Output Voltage: Input Source: 2 individual isolated unipolar circuits 1 bi-polar input circuit 9.8 Vdc to 16.2 Vdc (required to energize) 400 ohms impedance or higher. See tabulation on page 2. Connected to external battery source Required protection: Line-to-line and line-toground (ASTS USA USGA; ref. RSE-3H2) www.ansaldo-sts.com RSE-1D7, p. 1 Ansaldo STS USA Input Isolation Module (Formerly known as Union Switch & Signal) ® (MicroLok II and MicroLok® Object Controller Applications) RSE-1D7 Rev. 4-07 Specifications (cont’d) Ordering and Additional Information Input Impedance: See tabulation below • Short Circuit Protection: Continuous short circuit condition without damage • Unit Dimensions: See above diagam. Approximate Output Voltages Order No. N34800901 • Refer to ordering tabulation for module part numbers. Refer to RSE-3H2 for ordering information on USG-A Lightning Arresters. Request ASTS USA Service Manual SM-9488 for additional information on module installation and applications. Approximate Input Impedances Input Isolation Module Input Isolation Module (complete) MicroLok® is a registered trademark of Ansaldo STS USA, Inc. RSE-1D7, p. 2